WordNet sense 1 (indistinct or hazy in outline):

bleary, blurred, blurry, foggy, fuzzy, hazy

WordNet sense 2 (not clearly defined or easy to perceive or understand):

indistinct

WordNet sense 3 (confused and vague; used especially of thinking):

befuddled, muddled, woolly, wooly, addled, woolly-headed, wooly-minded

WordNet sense 4 (mentally confused; unable to think with clarity or act intelligently):

confused